JP6329735B2 - Sludge lump crusher - Google Patents

Description

  The present invention relates to a sludge lump crusher that separates and crushes solid sludge lump contained in sludge discharged from a tar decanter.

  Coke oven gas (COG) generated when carbonizing coal charged in the coke oven is cooled by spraying ammonia water (anhydrous water) in the rising pipe curved pipe portion at the top of the furnace. By this water spraying, tar accompanying COG is trapped in the water and flows into the tar decanter as COG cooling water. The COG cooling water that has flowed into the tar decanter is allowed to stand in the tar decanter, whereby it is separated into an upper layer made of water-resistant, a lower layer made of tar, and sludge that is a solid content.

  Sludge in the tar decanter is scraped out every predetermined time by a scraper laid on the bottom of the tar decanter, discharged from the tar decanter, and conveyed by a pipe conveyor or the like. However, since a coarse solid sludge lump having a diameter of about 100 mm contained in the sludge is difficult to convey by a pipe conveyor or the like, the sludge is passed through a screen mesh to separate the coarse solid sludge lump. The solid sludge mass deposited on the screen mesh is periodically removed manually.

  On the other hand, in Patent Document 1, sludge deposited on the bottom of a tar decanter is discharged from the tar decanter every predetermined time by a scraper or the like, and this tar decanter sludge is finely pulverized by a sludge crusher (rotary grindstone or vibration mill). A technique for returning to the tar decanter and dispersing it in the coal tar in the tar decanter is disclosed.

JP-A-53-082830

  However, Patent Document 1 does not have a specific description regarding a sludge crusher. Therefore, the details of the sludge crusher are not known, and there is a problem that the sludge crusher cannot be used for crushing the solid sludge lump.

  A crusher (crusher) that crushes (crushes) a solid material includes a hammer mill, a roll mill, a rotary rotor, and the like. However, when these are applied to crush a solid sludge mass, there are the following problems.

A hammer mill gives a solid impact to a solid by a hammer rotating at high speed, and instantly crushes the solid.
However, there is a case where high-strength exfoliated carbon formed by the coke oven riser is partially included in the solid sludge mass, and there is a risk that sparks are generated due to friction between the hammer rotating at high speed and the exfoliated carbon. Therefore, it is a safety problem to apply a hammer mill to pulverize a solid sludge lump to which tar which is a combustible material adheres.

The roll mill causes solid matter to be caught between two rolls rotating in opposite directions and pulverizes the solid matter by roll pressure.
However, since the solid sludge lump is slippery due to tar, an anti-slip projection must be formed on the roll surface, which increases the cost of roll production. Moreover, since the roll weight is large, there is a problem that the electric motor to be driven is enlarged.

A rotary rotor type crusher includes a rotary rotor installed horizontally and a screen mesh fixed so as to surround the rotary rotor, and a solid mesh is pressed against the screen mesh by a blade attached to the rotary rotor. The solid is crushed by passing.
However, since the solid sludge lump is slippery, when the solid sludge lump is pressed against the screen mesh with the rotating rotor, the solid sludge lump may not be caught by the screen mesh and may be rotated with the rotating rotor. In addition, since there is a gap between the rotating rotor and the screen mesh, the thin plate-like solid sludge mass remains on the screen mesh without being crushed, and there is a problem that the screen mesh is clogged.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a sludge lump crusher capable of efficiently separating and crushing solid sludge lump contained in sludge discharged from a tar decanter. To do.

  A coarse sludge lump having a diameter of about 100 mm can be conveyed by a pipe conveyor or the like if it is crushed to a diameter of about 30 mm. However, since only about several percent of the solid sludge mass is contained in the sludge, it is necessary to crush the solid sludge mass after separating the solid sludge mass from the sludge. If both the separation device and the crushing device are installed, it is possible to separate and crush the solid sludge mass, but there is a problem that the configuration becomes complicated. Further, tar is attached to the solid sludge mass, and there is a problem that it is slippery when crushing.

Accordingly, the present inventors have conceived the following invention in which a comb-tooth mechanism is provided in a rotary rotor type crusher provided with a screen mesh to efficiently separate and crush the solid sludge mass.
That is, the present invention is a sludge lump crusher for separating and crushing solid sludge lump contained in sludge discharged from a tar decanter,
A casing in which the sludge is charged, a rotating rotor that rotates around a rotating shaft that is disposed horizontally in the casing, a semi-cylindrical screen mesh that surrounds a lower half of the rotating rotor, and the rotating rotor A first comb tooth body having a rectangular comb tooth that is attached to the rotary rotor and rotates together with the rotary rotor, and a rectangular comb tooth that is fixed in the casing and protrudes from the mesh of the screen mesh toward the rotary rotor side There has been further comprising a second comb member you meshed with a first comb body and clearance.

  In the sludge lump crusher according to the present invention, the sludge containing the solid sludge lump having a mesh size equal to or smaller than the mesh size of the screen mesh passes through the screen mesh, and the solid sludge lump larger than the mesh size of the screen mesh is After being reliably crushed by the two comb teeth, it passes through the screen mesh.

In the sludge lump crusher according to the present invention, it is preferable that the plurality of first comb teeth are mounted on the rotary rotor at positions that are axially symmetric with respect to the rotation axis of the rotary rotor.
In this configuration, by mounting the plurality of first comb teeth at positions that are axially symmetric with respect to the rotation axis of the rotary rotor, the balance of the rotary rotor is maintained and the rotation of the rotary rotor is stabilized.

Further, in the sludge mass crushing machine according to the present invention, and preferably said second comb member are disposed immediately below the lowermost portion of the screen mesh.
The fixed sludge mass collects at the bottom of the semi-cylindrical screen mesh. Therefore, it is effective to arrange the second comb teeth at the bottom of the screen mesh.

Moreover, in the sludge lump crusher which concerns on this invention, it is suitable that the rotation speed of the said rotary rotor is 10 rpm or more and 30 rpm or less.
When the rotational speed of the rotary rotor is less than 10 rpm, the time for crushing the sludge mass becomes long. On the other hand, if the rotational speed of the rotating rotor exceeds 30 rpm, the solid sludge mass may be blown off by the rotating rotor and remain on the screen mesh for a long time without being bitten by the comb teeth.

Moreover, in the sludge lump crusher which concerns on this invention, you may be directly connected to the discharge port of the said tar decanter from which the said sludge is discharged | emitted.
The hardness of the solid sludge mass depends on the temperature of the sludge. The temperature of the sludge mass when discharged from the tar decanter is about 50 ° C., and the solid sludge mass is relatively soft. However, when the temperature decreases and the solid sludge mass becomes hard, the solid sludge mass becomes difficult to crush. Therefore, by directly connecting the sludge lump crusher to the discharge port of the tar decanter, reheating or the like is unnecessary, and the solid sludge lump can be efficiently crushed.

  In the sludge lump crusher according to the present invention, the first comb tooth body and the second comb tooth body mesh with each other, so that a coarse solid sludge lump including a plate-like sludge lump is reliably prevented from sliding on the screen mesh. To be crushed. As a result, no solid sludge mass remains on the screen mesh, and the solid sludge mass contained in the sludge discharged from the tar decanter can be efficiently separated and crushed.

It is a schematic diagram for demonstrating the processing method of the COG cooling water which flows in in a tar decanter from a coke oven. It is a disassembled perspective view of the sludge lump crusher which concerns on one embodiment of this invention. It is a top view of the sludge lump crusher. It is AA arrow sectional drawing of FIG. It is a BB arrow sectional view of Drawing 3. It is the elements on each comb of a 1st and 2nd comb-tooth body, and the elements on larger scale of a screen mesh.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.

  FIG. 1 shows a method for treating coke oven gas (COG) cooling water flowing into a tar decanter 11 from a coke oven (not shown). As described above, COG generated when carbonizing coal charged in a coke oven is cooled and washed by spraying ammonia water (safe water) in the rising pipe curved pipe section at the top of the furnace, and COG vent piping (illustrated) To the COG refining facility (not shown). On the other hand, the COG cooling water that has cooled and washed the COG flows into the tar decanter 11 from a branch pipe (not shown) branched from the COG vent pipe.

  The COG cooling water that has flowed into the tar decanter 11 is allowed to stand in the tar decanter 11 so that the solid content thereof is settled, and is separated into an upper layer H made of aqueous water, a lower layer L made of tar, and a sludge S. Aqueous water is fed from the tar decanter 11 to the rising pipe bent pipe and reused for cooling and washing of the COG.

  The sludge S deposited in the lower layer L is scraped out by a scraper 12 laid on the bottom of the tar decanter 11 and is discharged out of the tar decanter 11 from the discharge port 13. A sludge lump crusher 10 according to an embodiment of the present invention is directly connected to the discharge port 13 of the tar decanter 11. The sludge S discharged from the discharge port 13 is separated and crushed by the sludge lump crusher 10 and the solid sludge lump contained in the sludge S is conveyed by a pipe conveyor 14 disposed below the sludge lump crusher 10. .

FIG. 2 shows an exploded perspective view of the sludge lump crusher 10 according to the present embodiment. Moreover, the top view of the sludge lump crusher 10 is shown in FIG. 3, and sectional drawing is shown in FIG. 4, FIG. 5, respectively.
The sludge lump crusher 10 includes a casing 25 in which the sludge S is charged, a rotating rotor 21 that rotates around the rotating shaft 20 that is disposed horizontally in the casing 25, and a half that surrounds the lower half of the rotating rotor 21. And a cylindrical screen mesh 22. A pair of first comb teeth 23 that rotate together with the rotary rotor 21 is attached to the rotary rotor 21, and a second comb teeth 24 is disposed immediately below the bottom of the screen mesh 22.

The casing 25 has a horizontally long rectangular parallelepiped shape having dimensions of a width of 460 mm, a length of 1020 mm, and a height of 709 mm. An upper surface is opened, and a maintenance hatch 35 is provided on the short side surface 25a.
The rotary shaft 20 is disposed in the longitudinal direction of the casing 25 and is pivotally supported by a flange unit 34 with each short side mounted on the side surface 25a. One end portion of the rotating shaft 20 passes through the short side surface 25 a of the casing 25, and is connected to a variable speed reducer 30 and a motor 31 disposed outside the casing 25 via a connecting jig 29.

  The rotary rotor 21 is generally composed of disk-shaped disks 26 and 27 that are mounted on the rotary shaft 20 and a plurality of blades 28 that connect the disks 26 and 27. The disk is composed of a pair of end disks 26 disposed in the vicinity of the side surface 25 a of the short side of the casing 25 and an intermediate disk 27 disposed between the pair of end disks 26. The blade 28 is made of square material having a square cross section, is disposed in parallel with the rotary shaft 20, and is fixed to the peripheral portions of the pair of disks 26 and the intermediate disk 27 so as to be axially symmetric with respect to the rotary shaft 20.

  The semi-cylindrical screen mesh 22 is formed by assembling stainless steel wire rods 22a undulating in the out-of-plane direction of the screen mesh 22 in a lattice shape, and is placed on a screen receiver 33 formed of a semi-cylindrical lattice frame. ing. Both sides of the longitudinal direction of the screen receiver 33 are attached to the side 25b of the casing 25, and the rod receiver 32 provided on the side 25b of the casing 25 is turned to turn the screen receiver 33. It can be moved in the vertical direction (see FIG. 5).

The 1st and 2nd comb-tooth bodies 23 and 24 are each formed from the strip | belt material made from stainless steel, and the rectangular-shaped comb teeth 23a and 24a are each formed along one long side.
The pair of first comb teeth 23 is arranged in parallel with the rotation shaft 20, and the comb teeth 23 a are arranged on the peripheral portions of the pair of end disks 26 and the intermediate disk 27 so as to be axially symmetric with respect to the rotation shaft 20. It is fixed in a state facing outward in the radial direction.
The second comb tooth body 24 is arranged in parallel with the rotation shaft 20 and is fixed in the casing 25. Specifically, the comb teeth 24 a of the second comb tooth body 24 are fixed to the screen receiver 33 so as to protrude from the mesh at the bottom of the screen mesh 22 toward the rotary rotor 21.

FIG. 6 shows a partially enlarged view of the comb teeth 23 a and 24 a and the screen mesh 22 of the first and second comb teeth bodies 23 and 24. The comb teeth 23a of the first comb tooth body 23 have a width of 20 mm, a height of 4 mm, and an installation interval of 50 mm. On the other hand, the comb teeth 24a of the second comb tooth body 24 have a width of 18 mm, a height of 12 mm (a height protruding from the screen mesh 22 of 4 mm), and an installation interval of 50 mm.
The wire 22a constituting the screen mesh 22 has a wire diameter of 4 mm and a mesh size (mesh size) of 21.4 mm.

  The vertical clearance between the valleys 23b of the first comb teeth body 23 and the comb teeth 24a of the second comb teeth body 24, and the top teeth of the comb teeth 23a of the first comb teeth body 23 and the screen mesh 22 The vertical clearances are each set to 1 mm.

The size of the pipe conveyor 14 is determined by the amount of the sludge S transported, and the size of the solid sludge block that can be transported is determined by the size of the pipe conveyor 14. For example, in the case of a 100 A size pipe conveyor 14, the size of the solid sludge block that can be conveyed is about 30 mm or less. That is, the size of the solid sludge block that can be transported is determined according to the size of the pipe conveyor 14. Since only the transportable solid sludge mass is supplied to the pipe conveyor 14, the transportable solid sludge mass is sorted by the screen mesh 22 and supplied to the pipe conveyor 14.
In this embodiment, since the size of the pipe conveyor 14 is 100A, the size of the solid sludge lump that can be transported is 30 mm or less, and the mesh size of the screen mesh 22 is 21.4 mm with a diagonal length of 30 mm. .

On the other hand, the solid sludge block having a size exceeding 30 mm is crushed by meshing the first comb teeth 23 and the second comb teeth 24 into a size of 30 mm or less and passes through the screen mesh 22. It is supplied to the pipe conveyor 14.
In the present embodiment, the minimum clearance between the first comb tooth body 23 and the second comb tooth body 24 is set to 1 mm so as not to generate a solid sludge lump that is not crushed. Since it passes through the mesh 22, there is no practical problem even if the minimum clearance between the first comb teeth 23 and the second comb teeth 24 is about 20 mm.
In addition, if the height of the comb teeth 23a and 24a of the first and second comb teeth bodies 23 and 24 is increased, the thickness increases and costs increase in order to ensure the strength. Therefore, the first and second comb teeth The comb teeth 23a and 24a of the bodies 23 and 24 are preferably as low as possible.

Next, operation | movement of the sludge lump crusher 10 which has the said structure is demonstrated.
(1) The motor 31 is driven, decelerated by the variable speed reducer 30, and the rotational speed of the rotary rotor 21 is adjusted to 10 rpm or more and 30 rpm or less.
(2) The sludge S is charged into the casing 25 from above.
(3) The sludge S including the solid sludge block having a size of 30 mm or less passes through the screen mesh 22 and is supplied to the pipe conveyor 14. On the other hand, the solid sludge block having a size exceeding 30 mm is crushed by the meshing of the first comb teeth 23 rotating with the rotary rotor 21 and the second comb teeth 24 arranged at the bottom of the screen mesh 22. Then, it passes through the screen mesh 22 and is supplied to the pipe conveyor 14.

  In addition, when replacing | exchanging the screen mesh 22, the rod receiver 32 provided in the long side side 25b of the casing 25 is rotated, and the screen receiver 33 is moved below. Then, the screen mesh 22 is taken out from the maintenance hatch 35 provided on the short side 25a of the casing 25, the new screen mesh 22 is placed on the screen receiver 33, and the rod screw 32 is turned in the opposite direction to the previous one. The screen receiver 33 may be moved upward.

Finally, the test result verified about the effect of the sludge lump crusher 10 is demonstrated.
In the case of a rotary rotor crusher without the first comb teeth 23 and the second comb teeth 24, the sludge S that has passed through the screen mesh is 80% by mass, and 20% by mass sludge S is present on the screen mesh. Remained. On the other hand, in the case of the sludge lump crusher 10 to which the first comb teeth body 23 and the second comb teeth body 24 are attached, the sludge S that has passed through the screen mesh 22 is 100% by mass. Sludge S did not remain on the surface.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the configuration described in the above-described embodiment, and is within the scope of matters described in the claims. Other possible embodiments and modifications are also included. For example, in the above embodiment, the first comb teeth are paired, but may be two or more pairs. Similarly, in the said embodiment, although the 2nd comb-tooth body is made into one body, two or more bodies may be sufficient.

10: Sludge lump crusher, 11: Tar decanter, 12: Scraper, 13: Discharge port, 14: Pipe conveyor, 20: Rotating shaft, 21: Rotating rotor, 22: Screen mesh, 22a: Wire rod, 23: First Comb tooth body, 24: second comb tooth body, 23a, 24a: comb tooth, 23b: valley, 25: casing, 25a: short side surface, 25b: long side surface, 26: end disk 27: intermediate disk, 28: blade, 29: connecting jig, 30: variable speed reducer, 31: motor, 32: rod screw, 33: screen receiver, 34: flange unit, 35: maintenance hatch, H: upper layer, L : Lower layer, S: Sludge

Claims (5)

A sludge lump crusher for separating and crushing solid sludge lump contained in sludge discharged from a tar decanter,
A casing in which the sludge is charged, a rotating rotor that rotates around a rotating shaft that is disposed horizontally in the casing, a semi-cylindrical screen mesh that surrounds a lower half of the rotating rotor, and the rotating rotor A first comb tooth body having a rectangular comb tooth that is attached to the rotary rotor and rotates together with the rotary rotor, and a rectangular comb tooth that is fixed in the casing and protrudes from the mesh of the screen mesh toward the rotary rotor side There sludge mass crusher, characterized in that it comprises a second comb body you meshed with a first comb body and clearance.   2. The sludge lump crusher according to claim 1, wherein a plurality of the first comb teeth are mounted on the rotary rotor at positions that are axially symmetric with respect to the rotation axis of the rotary rotor. 3. Machine. According to claim 1 or 2 sludge lumps crusher according sludge lumps crusher, characterized in that said second comb member are disposed immediately below the lowermost portion of the screen mesh.   The sludge lump crusher of any one of Claims 1-3 WHEREIN: The rotation speed of the said rotary rotor is 10 rpm or more and 30 rpm or less, The sludge lump crusher characterized by the above-mentioned.   The sludge lump crusher according to any one of claims 1 to 4, wherein the sludge lump crusher is directly connected to a discharge port of the tar decanter from which the sludge is discharged.

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